Brake



Feb. 26, 1935. -R. A. GoEPFRlcH 1,992,207

l lBRAKE Filed'Jan. 29, 1931 INVENTOR. RUDOLPH A.GoEPFR\cl-| Y ATTORNEY Patented Feb. 26,1935 l1,992,207 l UNITED s'm'rlazsA PATENT yol-Flolaz l BRAKE Rudolph A. Goepfrich, South Bend, Ind., asslgnor to Bendix Brake Company, South Bend, Ind., a corporation of Illinois Application January 29, 1931,- Serial No. 511,995 11 claims. (cl. iss-vs)` This invention relates to brakes and more par- 28 and 30 are arranged in transverse relation with ticularly to internal expanding brakes. respect 'to each other, the object of which will Broadly, the invention.A comprehends a fixed. hereinafter appear. Y l support having associated therewith a rotatable The separable ends of the friction elements 16 5 drum, together with interchangeable shoes 0r and 18 are provided with transverse openings for 5 friction elements connected by linkage including the receptlon'cf suitable anchors 32 and 34, and bell crank levers adjustably positioned on the mounted on the backing plate between the sep' i'lxed support and so arranged that when force is arable ends of the friction elements 16 and 18 is applied through the operating cam to spread the a floating operating cam 36. .Since this cam forms l shoes for engagement with the drum, .the levers no part of the present invention, description 10 are rocked and through their connections apply thereof is deemed unnecessary. force to both the heel and toe of the auxiliary Adjustably mounted on the backing platead-` yshoe. jacent the operating cam is a bell crank lever 38 An object of the invention is to provide means having one end connectedlby a link 40 to the l for more effectively applying the friction eleshoe 16 and its other end connected by a link 42 l5 ments. to the shoe 18, the objectof which will herein- Another object oi the invention is to provide after appear, and the shoes 16 and 18 are cona brake structure embodying means for distributnected by a suitable return spring 44. This spring ing the applied force with a substantial increase serves to return the shoes to the off position and 20 dueto the wiping action of the drum to the heel to retain them when in this position in proper 20 and toe of the secondary shoe. spaced relation to the braking surface of the Another object of the invention is the producdrum. tion of a brake in which the structure is exceed- Each of the levers 26 and 38 is centrally mountingly cheap and simple and which will efliciently ed on a pivot clamped (e. g. bya nut threaded on .25 perform its intended function. its end) in a radially-extending slot in the back- A further object of the invention is to provide ing plate, and can be adjusted by 'loosening the a brake having relatively few interchangeable nut and tapping the pivot to shift it in its slot. parts which may be easily and quickly assembled. Adjustment of lever 26 downward spreads the Other objects of the invention will appear lower ends of the shoes apart to adjust the brake 30 from the following description taken in connecfor wear. Lever 38 Vis adjusted to bring both 30 tion with the drawing, which forms a part of this shoes against anchors 32 and 34 whenthe brake specification, and in which: is released.

Figure 1 is a vertical sectional view taken just When the cam is rotated to apply the brake, back of the head of the drum illustrating the inthe shoe 16 is moved into engagement with the 35 -vention as applied; braking surface of the drum. This movement of 35 lFigure 2 is a sectional view substantially on the shoe rocks thevbell crank lever 38 through tle line 2 2, Figure 1; and link 40 to apply pressure through the link 42 to the Figure 3 is a sectional view substantially on line secondary shoe 18. Simultaneously with this 3-3, Figure 1. movement. pressure is applied through the shoe 16 Referring to the drawing for more specific dewith a substantial increase due to the wiping ac- 40 tails of the invention, 10 represents a fixed suption of the drum to the link 28 to rock the bell port such as a backing plate, and associated with crank lever 26 which applies pressure through the the backing plate is a rotatable drum 12. vAs .link 30-to the articulated end of the auxiliary shown, the backing plate has positioned thereon shoe 18. Since the bell crank levers 26 and 38 suitable steady rests 14 supporting interchangemay be readily adjusted on the backing plate, the 45 able shoes 16 and 18. Each of the shoes comprises relation of the shoes 16 and 18 to the braking sura web 20 supporting a rim 22 to which is suitably face of the drum inay be readily determined. secured a lining V24. adaptable for co-operation While preferred embodiments of the invention with the braking surface of the drum. have been described, it is to be understood that Adjustably positioned on the backing plate 10 these are given merely as examples of the under- 50A is a bell crank lever 26, one end of which is conlying principles of the invention, and since these nected by a link 28 to the articulated end of the may be incorporated in other specific mechanishoe 16 and the other end of the bell crank lever cal structures, I do not intend to be limited to 5 is connected by a link 30 to the articulated end those shown, except as such limitations are clearoi the shoe 18. It will be observed that the links 1y imposed by the appended claims. 55

Having thus described the various features of tlfe invention, what I claim as new and desire to secure by Letters Patent is:

l. A brake comprising friction elements hav-y ing their respective opposite ends connected by linkages including bell crank levers, and an applying device separate from said linkages andacting on said shoes. A

2. A brake comprising corresponding friction.

friction elements, a pair of linkages each connecting one pair'of endsof the friction elements including bell crank levers and adjustable mea supporting the bell crank levers. A s

4. A brake comprising a pair of corresponding friction elements, bell crank levers, adjustable means supporting the levers and means connecting each of the levers to two adjacent ends of the friction elements. a

5. A brake comprising arbacking plate, corresponding friction elements arranged end to end thereon, two bell crank levers adjustable on the backing plate and links connecting each of the levers to the ends of both of the friction elements. a

6. A brake comprising corresponding friction elements arranged end to end and having an anchorage and a linkage separate from said anchorage and connecting the adjacent ends of the friction elements including a bell crank lever, and links connecting eachend'of said lever to the opposite one of the friction elements.

7. A brake comprising a backing plate, friction elements arranged end to end thereon, two bell crank levers adjustably arranged on the backing plate, links connecting the ends of one of the levers to the separable-ends of the `friction elements and links connecting the ends of the other lever to the articulated ends of the friction elements.

8. A brake comprising a backing plate, a drum associated therewith, corresponding friction elements arranged end to end on the backing plate for co-operation with the drum and two bell crank levers adjustable on the backing plate, one of the bell crank levers having its respective ends connected to the separable ends of the friction elements, the other bell crank lever having' its respective ends connected to the articulated ends of the friction element by links arranged in transverse relation. f v

9. A brake comprising friction elements arranged end to end, a pivoted lever, and links arranged to cross each other in transverse relation and connecting the ends of the lever to the adjacent ends of the friction elements.

10. A brake comprising a xed support, friction elements arranged end to end thereon, an adjustable support on -the fixed support, a bell crank lever pivoted at its knee on the adjustable support and two links arranged in transverse relation and connected between the ends of the lever and the adjacent ends of the friction elements. 7 y 11. A brake comprising a fixed support, friction elements arranged end to end on the xed support, an adjustable member on the fixed support, a bell'crank levervpivoted at its knee to the adjustable member and two links each pivoted at one end lto the respective ends of the lever and having their other ends pivotedto the articulated ends of the friction elements, said links being arranged to cross each other transversely with respect to each other.

RUDOLPH A. GOEPFRICH. 

